Device for incandescent lamps with metal filaments.



I C. G. H. REMANE. DEVICE, FOR INCANDESCENT LAMPS WITH METAL FILAMENTS.

I APPLICATION FILED MAR. 30, I9l0. 1,145,213.

Patented July 6, 1915.

' filament supported at both ends and provided with a check or obstacle applied at one CARL'GU'STAV HERMANN REMADIE, OF BERLIN, GERMANY, ASSIGNOR T0 GENERAL I ELECTRIC COMPANY, OF SCHENEGTADY, NEW YORK, A CORPORATION OF NEW YORK.

To all whom it may concern:

Be it known that I, CARL GUSTAV-Huamany, S. WV. Planufer 14:, have invented a certain new and useful Improvement in De vices for Incandescent Lamps with'Metal Filaments; and I do hereby declare the following to be a full, clear, and exact description of the; invention, such as will enable others skilled in the art to which it apper? tains to make and use the same,-reference being had to the accompanying drawings,

and to letters of references marked thereon,

which-form a part of this specification.

This invention has for its object to over come the deleterious efiects resulting from the oscillations of-filaments 1n incandescent lamps and consists in providing a check or obstacle intermediate of the length of thefilament so as to prevent development of the oscillations or of reducing the amplitude.

In the drawings, Figure 1 illustrates a vibrating filament supported at one end only. Fig. 2 shows a vibrating filament suppprted at both ends. Fig. 3 illustrates a vibrating point intermediate or the filament; Fig. 4: illustrates a lamp having four lengths of filament and provided with obstacles intermediate of each; four possible variations being visualized in this one figure, and Fig. 5 shows the obstacle in the form of a helical spring.

In the drawings, a is the lamp stem, Z is the filament, 9 indicates the lines of vibration, 0 p p p are the filament supports, 6, (Z are the supports for the check carrying arms; 0 c 0*, g are the arms; 0, 0 0 0 0*, 0 0 are the checks or obstacles operative upon the filament; 1' is a tubular obstacle, and 1' a helical spring.

In incandescent lamp-s with loop shaped metal filaments, shocks or rythmic vibrations can lead to oscillations of the filaments, which oscillations differ according to the special arrangement of the points of fastening or supporting of the filament loops. A filament loop which is held merely atthe current supply points by soldertng, cementing or clamps, and has no otherpoints of support, will oscillate as shown lIlFlg'. 1, in the same Way as a. kind of tuning fork.

Specification of Letters Patent.

Application filed March 30, 1910. Serial No. 552,368.

' DEVICE FOR INCANDESCENT LAMPS WITH METAL FILAMENTS.

Patented July 6, 1915.

If at the loop point or ,bend of'the filament there is provided a support, the oscillations will be similar to those shown in Fig. 2, which eventuallv mav combine with oscillations of the kind first referred to.

The substance of this invention consists in ebviating oscillations of metal filaments of incandescent lamps, or in considerably limiting and rendering them harmless, by providing an obstacle for the development of such oscillations, or at least by considerably reducing their amplitude. This is efi'ected by surrounding the filaments near the nbnyielding points of securing (29 39 39 39* Fig. 4) with loops or eyes (0 0 0 0 of sufficiently small diameter, so that a second node of oscillations is provided at the point where these loops are arranged, or at an adjoining point (Fig. 3, 0). Owing to this strongly unsymmetrical sub-division'of the filament loop, the filament is divided into two or three parts, which, owing to their different lengths get a very different duration-of own oscillations, andtherefore, interfere with each other by dissonance when oscillations take place (Fig. At the same time, owing to this arrangement, the appearance of oscillation resonances is altogether rendered more difiicult. The amplitudes taking'place are reduced, and the danger of a thread breaking is considerably re-' duced by these devices.

If only one loop or eye is used for each filament branch, the said loops are preferably arranged fairly near the points of securing (Fig. 4, 0 0 If two such oscillations-dampin'g devices are used foreach 'diflerent branch, they are preferably arranged as near as possible to the-existing points of the greatest rigidity or of the greatest bending momentum (Fig. 4:, on the left, 0 0 0- 0). These eyes or loops (Fig.

4, 0 0 0 0 can be supported either by the stem of the filament-supporting frame located adjacent to the filament What I claim is I Means for supporting filaments iiorjncandescent lamps comprising a main supporting member, end supporting members carried by said main supporting member,said end supporting members being adapted 'to hold a filament in a relatively fixed position, a stop at a point close to one of said end supportingmembers and adapted upon contact with the filament when vibrating for its full length to set" up therein secondary vibrations of different lengths, said stop being insulated from the lam circuit and normally out of contact with the filament,but sulficiently close there,-

Copies of this patent may be obtained for between its supports will be interfered to laterally to be momentarily touched thereby as .the filament is subjected to vibrations whereby the free vibration of the filaments with bythe counteracting force of vibrations of a difierent character, the filament being thus restored to an approximately non-vibrating condition.

In testimony whereof I affix my signature in presence of two witnesses.

om GUSTAV HERMANN REMANE.

, Witnesses:

HENRY srnn, WOLDEMAR HAUPT.

five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

